We present a unified approach to quantum error correction, called operator quantum error correction. Our scheme relies on a generalized notion of a noiseless subsystem that is investigated here. By combining the active error correction with this generalized noiseless subsystems method, we arrive at a unified approach which incorporates the known techniques--i.e., the standard error correction m...

purpose:the user interface of federated search engines is very important because it can make effective search, retrieval, and user interaction with the system. . identifying the most important indicators of the federated search engine user interface is a solution to enhance the applicability of the search engine interface. the purpose of this study was to examine the role of search, screen, nav...

Any research or policy analysis exercise in economics must be consistent with the timeseries properties of observed macroeconomic data. This paper discusses in detail the specification of a six-variable vector error-correction forecasting model. We test for cointegration among those variables: the CPI, the implicit price deflator for GDP, real money balances (M1), the federal funds rate, the yi...

This paper is an expanded and more detailed version of the work [1] in which the Operator Quantum Error Correction formalism was introduced. This is a new scheme for the error correction of quantum operations that incorporates the known techniques — i.e. the standard error correction model, the method of decoherence-free subspaces, and the noiseless subsystem method — as special cases, and reli...

Since Quenouille’s influential work on multiple time series, much progress has been made towards the goal of parameter reduction and model fit. Relatively less attention has been paid to the systematic evaluation of out-of-sample forecast performance of multivariate time series models. In this paper, we update the hog data set studied by Quenouille (and other researchers who followed him). We r...

This paper considers the implications of the permanent/transitory decomposition of shocks for identi…cation of structural models in the general case where the model might contain more than one permanent structural shock. It provides a simple and intuitive generalization of the in‡uential work of Blanchard and Quah (1989), and shows that structural equations for which there are known permanent s...

Complete removal of breast cancer during a single breastconserving lumpectomy procedure is often challenging due to the lack of adequate intraoperative tools to accurately determine the margin status. About one-third of lumpectomy patients are found to have positive margins upon final histologic analysis, which usually is reported within a week after surgery. These patients are then required to...